Question

Stay awake! You should know that it ________ to sleep in class.

A．doesn’t permit	B．is not permitted
C．will not be permitted	D．was not permitted

Answer 1

B

试题分析：句意：保持清醒，你应该知道在课堂上是不允许睡觉的。这里it是形式主语，to sleep in class是真正的主语，根据Stay awake可知说的现在不能睡觉，所以应该用现在时故选B。
点评：本题难度适中。动词时态及语态是高中阶段的重难点之一，高中要求掌握的时态需要考生牢记它们的用法，但是时态必须要结合一定的语境才能做出正确的判断。
即学即练：--- I hear you _______ at Smith’s.
--- Yes, I________there for about three months.
A．work; had been working 
B．worked; was working
C．are working; have been working 
D．worked; have worked
解析：C。句意：---我听说你在史密斯那里工作。---是的，我一直在那里工作了3个月。